Shartley has a a-5 being built that looks daggone nice. Very compact and light looking.
I used a flatline, Egrip, RVA, stab, air through stock,and had a scepter launcher on mine so I probobly could not give good advice to you.
Are you using this for scenario games, speedball, both, or mostly woods/rec play?
2 websites you might look at are www.milsimog.com
Milsim has some cool ideas floating around, ums have the cream of the crop of A-5 users.
There are no silly a-5 questions, but remember: washer first,then the o-ring,tombstone holds it all in place. If you don't know what this means you soon will.